Crazy Aarons Thinking Putty - Glows 4" TinCrazy Aarons Glow in the Dark Thinking Putty is a firm putty with a magical quality. The putty is plain white in daylight and comes alive at dark with a fantastic hypnotic a colour. Expose the putty to light (the brighter the better) and it will glow for hours. You can tear, knead, twist, bounce, sculpt and stretch Crazy Aarons Thinking Putty. With so many play options children will be amazed by the brilliant ideas they create with a handful of putty.